Password Generator
Generate strong, random passwords with customizable length, uppercase, lowercase, numbers, and symbols. Cryptographically secure with strength meter.
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About Password Generator
This password generator uses the browser's crypto.getRandomValues() API, which provides cryptographically secure random numbers. This is the same source of randomness used by security libraries and cryptocurrency wallets.
The strength meter calculates password entropy based on the character pool size and length. The crack time estimate assumes an attacker making 10 billion guesses per second, representing modern GPU-based brute force capabilities.
All passwords are generated locally in your browser. Nothing is stored or transmitted.
How to Use This Password Generator
This free online password generator creates strong, random passwords using cryptographically secure randomness. Follow these steps:
- Set the password length using the slider. We recommend at least 16 characters for standard accounts and 24+ for high-security accounts.
- Choose character types — enable or disable uppercase letters, lowercase letters, numbers, and symbols. Using all four types maximizes password strength.
- Check the strength meter to see the entropy level and estimated time to crack your password.
- Copy the password using the copy button and store it in your password manager.
All passwords are generated locally in your browser using the Web Crypto API. Nothing is ever stored or sent to a server.
Common Use Cases
- Account registration — Generate unique, strong passwords for new online accounts.
- Password rotation — Create new passwords when updating credentials for security compliance.
- Cryptocurrency wallets — Generate strong passwords for wallet encryption and exchange accounts.
- API keys and tokens — Create random strings for API authentication secrets and tokens.
- Wi-Fi passwords — Generate long, secure passwords for wireless network access.
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Frequently Asked Questions
How secure are the generated passwords?
The passwords are generated using the Web Crypto API (crypto.getRandomValues), which provides cryptographically secure random numbers. This is the same randomness source used by security libraries, TLS/SSL, and cryptocurrency wallets. The generated passwords are never stored or transmitted.
What makes a strong password?
A strong password should be at least 12 characters long and include a mix of uppercase letters, lowercase letters, numbers, and symbols. Longer passwords are exponentially harder to crack. A 16-character password with all character types has approximately 105 bits of entropy, which would take billions of years to brute force.
What does 'exclude ambiguous characters' mean?
Ambiguous characters are letters and numbers that look similar in many fonts: 0 (zero) and O (letter O), 1 (one) and l (lowercase L) and I (uppercase i). Excluding them prevents confusion when manually typing passwords, which is useful for printed passwords or shared credentials.
How is the crack time calculated?
The crack time estimate assumes an attacker performing 10 billion guesses per second, which represents modern GPU-based brute force capabilities. The calculation is based on the total number of possible combinations (character pool size raised to the power of password length), divided by the guessing rate.
How long should my password be?
For most purposes, 16 characters is a good balance between security and usability. For high-security accounts (banking, cryptocurrency), use 20-24 characters or more. For Wi-Fi passwords, 20+ characters are recommended since they only need to be entered once.
Are the passwords stored anywhere?
No. All passwords are generated entirely in your browser using the Web Crypto API. Nothing is stored in cookies, local storage, or sent to any server. Once you close or refresh the page, the generated passwords are gone.
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